In April 2003, a month after Corning's political action committee gave $10,000 to her re-election campaign, Mrs. Clinton announced legislation that would provide hundreds of millions in federal aid to reduce diesel pollution, using, among other things, technology pioneered by Corning. It was one of several Congressional initiatives Mrs. Clinton has pushed that benefit the company.

And in April 2004, Mrs. Clinton began a push to persuade the Chinese government to relax tariffs on Corning fiber optics products, inviting the Chinese ambassador to her office and personally asking President Bush for help in the matter. One month after the beginning of that ultimately successful effort, Corning's chairman, James Houghton, held a fund-raiser at his home that collected tens of thousands of dollars for her re-election campaign.